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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Reactivity and Structural Defects in Glaserite-Type Iron-Vanadates
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Reactivity and Structural Defects in Glaserite-Type Iron-Vanadates

机译：葡萄牙型铁钒酸盐中的反应性和结构缺陷

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We investigated (a) the redox reaction of FeO and Ag2O in the presence of BaCO3 and V2O5 under inert atmosphere and (b) the oxidation of FeO in air in the presence of BaCO3, Na2CO3, and V2O5. The reaction products are members of the glaserite-type of compounds: Ba(Ag)Fe[VO4](2) [a = 5.47397(4) angstrom, c = 7.1780(1) angstrom, P3]; BaNa1.63Fe0.79[VO4](2) [a = 9.672(1) angstrom, b = 5.5860(6) angstrom, c = 14.1505(4) angstrom, beta = 90.042(9)degrees, C2/c]; and Ba(Ba,Na)Na[VO4](2) [a = 5.8478(2) angstrom, c = 7.3835(3) angstrom, P3m1]. The latter presents an example for a statistical distribution of differently charged ions with differences in ionic radii (Ba2+ and Na+) on the B site of the general formula AB(2)M[VO4](2). The iron compounds exhibit differences in the defect concentration and localization of voids. For Ba(Ag)Fe[VO4](2) the Fe3+-triangular lattice remains intact and the Ag substructure is depleted by 50 % through the redox reaction (a). In contrast, for BaNa1.63Fe0.79[VO4](2) defects occur on both sites (B = Na+ and M = Fe3+) with a total of 0.58 defects per formula unit. Extended Fe-57-Mossbauer studies on a series of Fe-glaserite compounds relate structural findings from Rietveld refinements of X-ray diffraction data with defect concentrations, substitution variants, and charge distributions.
机译：我们研究了（a）FeO和Ag2O在惰性气氛下Baco3和V2O5存在下的氧化还原反应，（b）在Baco3，Na 2 CO 3和V2O5存在下的空气中的Feo氧化。反应产物是葡萄牙型化合物的成员：Ba（Ag）Fe [VO4]（2）[A = 5.47397（4）埃，C = 7.1780（1）埃埃斯特罗姆，P3]; BANA1.63FE0.79 [VO4]（2）[A = 9.672（1）埃，B = 5.5860（6）埃，C = 14.1505（4）埃，β= 90.042（9）度，C2 / C];和Ba（Ba，Na）Na [VO4]（2）[A = 5.8478（2）埃，C = 7.3835（3）埃，P3M1]。后者呈现了在通式AB（2）m [Vo4]（2）的B位点上具有离子半径（Ba2 +和Na +）的不同电荷离子的统计分布的示例。铁化合物表现出缺陷浓度和空隙定位的差异。对于BA（AG）Fe [VO4]（2）Fe3 + -triangular晶格保持完整，并且通过氧化还原反应（A）耗尽50％的Ag次结构。相反，对于BANA1.63FE0.79 [VO4]（2）在两个位点（B = NA +和M = FE3 +）上发生缺陷，总共每种配方单元的0.58缺陷。延长FE-57-MOSSBAUER关于一系列FE-Glaserite化合物的研究与X射线衍射数据的RIETVELD细化具有缺陷浓度，替代变体和电荷分布的结构调查。

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